Bump codecov/action to v2.0.2 (#24983)

* build(deps): bump codecov/codecov-action from 1 to 2.0.1

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 1 to 2.0.1.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](https://github.com/codecov/codecov-action/compare/v1...v2.0.1)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update arguments to codecov action

* Try to delete the symbolic link to root folder

Hopefully this should get rid of the ELOOP error

* Delete also for shell tests and MacOS

* Bump to v2.0.2

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/unit_tests.yaml

@@ -180,7 +180,7 @@ jobs:
           SPACK_TEST_SOLVER: ${{ matrix.concretizer }}
       run: |
           share/spack/qa/run-unit-tests
-    - uses: codecov/codecov-action@v1
+    - uses: codecov/codecov-action@v2.0.2
       if: ${{ needs.changes.outputs.with_coverage == 'true' }}
       with:
         flags: unittests,linux,${{ matrix.concretizer }}
@@ -232,7 +232,7 @@ jobs:
           COVERAGE: true
       run: |
           share/spack/qa/run-shell-tests
-    - uses: codecov/codecov-action@v1
+    - uses: codecov/codecov-action@v2.0.2
       if: ${{ needs.changes.outputs.with_coverage == 'true' }}
       with:
         flags: shelltests,linux
@@ -348,7 +348,7 @@ jobs:
           SPACK_TEST_SOLVER: clingo
       run: |
           share/spack/qa/run-unit-tests
-    - uses: codecov/codecov-action@v1
+    - uses: codecov/codecov-action@v2.0.2
       if: ${{ needs.changes.outputs.with_coverage == 'true' }}
       with:
         flags: unittests,linux,clingo
@@ -384,12 +384,15 @@ jobs:
           coverage run $(which spack) unit-test -x
           coverage combine
           coverage xml
+          # Delete the symlink going from ./lib/spack/docs/_spack_root back to
+          # the initial directory, since it causes ELOOP errors with codecov/actions@2
+          rm lib/spack/docs/_spack_root
         else
           echo "ONLY PACKAGE RECIPES CHANGED [skipping coverage]"
           $(which spack) unit-test -x -m "not maybeslow" -k "package_sanity"
         fi
-    - uses: codecov/codecov-action@v1
+    - uses: codecov/codecov-action@v2.0.2
       if: ${{ needs.changes.outputs.with_coverage == 'true' }}
       with:
-        file: ./coverage.xml
+        files: ./coverage.xml
         flags: unittests,macos